Supercurrent Flow in Multi-Terminal Graphene Josephson Junctions

TL;DR

This paper explores supercurrent flow in multi-terminal graphene Josephson junctions, revealing coexistence of superconducting and dissipative currents, electron heating effects, and efficient cooling mechanisms in encapsulated graphene.

Contribution

It provides new insights into supercurrent behavior and dissipation in multi-terminal graphene Josephson devices, highlighting electron heating and cooling dynamics.

Findings

Supercurrent flow occurs among multiple terminals in graphene junctions.

Superconducting and dissipative currents coexist in the same graphene region.

Electrons are efficiently cooled via electron-phonon coupling.

Abstract

We investigate the electronic properties of ballistic planar Josephson junctions with multiple superconducting terminals. Our devices consist of monolayer graphene encapsulated in boron nitride with molybdenum-rhenium contacts. Resistance measurements yield multiple resonant features, which are attributed to supercurrent flow among adjacent and non-adjacent Josephson junctions. In particular, we find that superconducting and dissipative currents coexist within the same region of graphene. We show that the presence of dissipative currents primarily results in electron heating and estimate the associated temperature rise. We find that the electrons in encapsulated graphene are efficiently cooled through the electron-phonon coupling.